CVE-2026-82539

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-30. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation of the argument desc can lead to memory corruption. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
57(Track*)
EG Risk 57/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

August 30, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

TOTOLINK | Wi-Fi 7, Mesh, 5G & Enterprise Networking

https://www.totolink.net/
generic

GitHub - Xernary/CVE-2026-82539: Security advisory for TOTOLINK a720r buffer overflow vulnerability · GitHub

https://github.com/Xernary/CVE-2026-82539

Vendor Advisories for CVE-2026-82539(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 52× in last 7d / 202× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 202 total refreshes for this CVE.

  1. 2026-09-25 06:22 UTCGHSA enrichment
  2. 2026-09-25 02:14 UTCGHSA enrichment
  3. 2026-09-24 22:06 UTCGHSA enrichment
  4. 2026-09-24 16:47 UTCEG score recompute
  5. 2026-09-24 16:47 UTCGHSA enrichment
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 12:24 UTCGHSA enrichment
  8. 2026-09-24 08:16 UTCGHSA enrichment
  9. 2026-09-24 04:08 UTCGHSA enrichment
  10. 2026-09-24 00:00 UTCGHSA enrichment
  11. 2026-09-23 19:51 UTCEG score recompute
  12. 2026-09-23 19:51 UTCGHSA enrichment
  13. 2026-09-23 17:54 UTCEPSS rescore
  14. 2026-09-23 15:26 UTCGHSA enrichment
  15. 2026-09-23 11:15 UTCGHSA enrichment
  16. 2026-09-23 07:07 UTCGHSA enrichment
  17. 2026-09-23 02:59 UTCGHSA enrichment
  18. 2026-09-22 22:51 UTCGHSA enrichment
  19. 2026-09-22 18:43 UTCEG score recompute
  20. 2026-09-22 18:43 UTCGHSA enrichment
  21. 2026-09-22 16:01 UTCEPSS rescore
  22. 2026-09-22 14:22 UTCGHSA enrichment
  23. 2026-09-22 10:12 UTCGHSA enrichment
  24. 2026-09-22 06:03 UTCGHSA enrichment
  25. 2026-09-22 01:55 UTCGHSA enrichment
Show 75 more
  1. 2026-09-21 21:47 UTCEG score recompute
  2. 2026-09-21 21:47 UTCGHSA enrichment
  3. 2026-09-21 21:09 UTCEPSS rescore
  4. 2026-09-21 17:39 UTCGHSA enrichment
  5. 2026-09-21 13:26 UTCGHSA enrichment
  6. 2026-09-21 09:18 UTCGHSA enrichment
  7. 2026-09-21 05:10 UTCGHSA enrichment
  8. 2026-09-21 00:26 UTCGHSA enrichment
  9. 2026-09-20 20:18 UTCEG score recompute
  10. 2026-09-20 20:18 UTCGHSA enrichment
  11. 2026-09-20 20:16 UTCEPSS rescore
  12. 2026-09-20 16:10 UTCGHSA enrichment
  13. 2026-09-20 11:56 UTCGHSA enrichment
  14. 2026-09-20 07:20 UTCGHSA enrichment
  15. 2026-09-20 02:36 UTCGHSA enrichment
  16. 2026-09-19 22:28 UTCGHSA enrichment
  17. 2026-09-19 18:20 UTCEG score recompute
  18. 2026-09-19 18:20 UTCGHSA enrichment
  19. 2026-09-19 14:12 UTCGHSA enrichment
  20. 2026-09-19 10:03 UTCGHSA enrichment
  21. 2026-09-19 05:55 UTCGHSA enrichment
  22. 2026-09-19 01:47 UTCGHSA enrichment
  23. 2026-09-18 21:39 UTCEG score recompute
  24. 2026-09-18 21:39 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
  26. 2026-09-18 17:31 UTCGHSA enrichment
  27. 2026-09-18 13:21 UTCGHSA enrichment
  28. 2026-09-18 09:13 UTCGHSA enrichment
  29. 2026-09-18 05:05 UTCGHSA enrichment
  30. 2026-09-18 00:57 UTCGHSA enrichment
  31. 2026-09-17 20:49 UTCEG score recompute
  32. 2026-09-17 20:49 UTCGHSA enrichment
  33. 2026-09-17 15:37 UTCGHSA enrichment
  34. 2026-09-17 11:28 UTCGHSA enrichment
  35. 2026-09-17 07:19 UTCGHSA enrichment
  36. 2026-09-17 03:07 UTCGHSA enrichment
  37. 2026-09-16 22:58 UTCGHSA enrichment
  38. 2026-09-16 18:50 UTCEG score recompute
  39. 2026-09-16 18:50 UTCGHSA enrichment
  40. 2026-09-16 14:08 UTCEPSS rescore
  41. 2026-09-16 14:05 UTCGHSA enrichment
  42. 2026-09-16 09:22 UTCEG score recompute
  43. 2026-09-16 09:22 UTCGHSA enrichment
  44. 2026-09-16 05:15 UTCEPSS rescore
  45. 2026-09-16 05:13 UTCGHSA enrichment
  46. 2026-09-16 01:05 UTCGHSA enrichment
  47. 2026-09-15 20:57 UTCGHSA enrichment
  48. 2026-09-15 16:49 UTCGHSA enrichment
  49. 2026-09-15 12:41 UTCGHSA enrichment
  50. 2026-09-15 08:30 UTCGHSA enrichment
  51. 2026-09-15 04:22 UTCEG score recompute
  52. 2026-09-15 04:22 UTCGHSA enrichment
  53. 2026-09-15 03:12 UTCEPSS rescore
  54. 2026-09-15 03:12 UTCEPSS rescore
  55. 2026-09-15 00:12 UTCGHSA enrichment
  56. 2026-09-14 20:04 UTCGHSA enrichment
  57. 2026-09-14 15:55 UTCGHSA enrichment
  58. 2026-09-14 11:47 UTCGHSA enrichment
  59. 2026-09-14 07:39 UTCGHSA enrichment
  60. 2026-09-14 03:31 UTCGHSA enrichment
  61. 2026-09-13 23:24 UTCGHSA enrichment
  62. 2026-09-13 19:16 UTCEG score recompute
  63. 2026-09-13 19:16 UTCGHSA enrichment
  64. 2026-09-13 15:07 UTCGHSA enrichment
  65. 2026-09-13 10:59 UTCGHSA enrichment
  66. 2026-09-13 06:51 UTCGHSA enrichment
  67. 2026-09-13 02:34 UTCGHSA enrichment
  68. 2026-09-12 22:25 UTCGHSA enrichment
  69. 2026-09-12 18:16 UTCEG score recompute
  70. 2026-09-12 18:16 UTCGHSA enrichment
  71. 2026-09-12 14:08 UTCGHSA enrichment
  72. 2026-09-12 10:00 UTCGHSA enrichment
  73. 2026-09-12 05:52 UTCGHSA enrichment
  74. 2026-09-12 01:44 UTCGHSA enrichment
  75. 2026-09-11 21:36 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCXernary/CVE-2026-82539
    First seen Jul 12, 2026

    Security advisory for TOTOLINK a720r buffer overflow vulnerability

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82539?
CVE-2026-82539 is a critical vulnerability published on August 30, 2026. A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation of the argument desc can lead to memory corruption. The attack may be launched remotely. The exploit…
When was CVE-2026-82539 disclosed?
CVE-2026-82539 was first published in the National Vulnerability Database on August 30, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82539 actively exploited?
CVE-2026-82539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 44.2% of all scored CVEs.
What is the CVSS score of CVE-2026-82539?
CVE-2026-82539 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-82539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82539, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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